Portable elevator



5 Sheets-Sheet 2 Im/entm M. M. HAlDER PORTABLE ELEVATOR Filed May 20, 1941 Feb. 17, 1942.

Feb. 17, 1942.

M.' M. HAIDER PORTABLE EVLEVATOR 5 sheets-sheet sf Filed May 20, 1941 Inventor 6'0 f5 /l/af i@ /J/faa'er Attorney 'III II'IIIIILI Feb. 17,1942.

M. M. HAIDER PORTABLE ELEVATOR Filed May 20, 1941 5,Shee'l',s-Sheet 4 Inventor En M /fpdef' A Home] Feb.17,1942. M MHNDER -,2,273,572

PORTABLE ELEVATOR Filed May 20, 1941 5 Sheets-Sheet 5v .f if f IL \%C,f 7.

d/ Inventor A flor/1e)y Patenied Feb. `17, 1942 PORTALE ELEVATOR Martin M. Haider, St. .PauL Minn., assgnor of one-third to Joseph G. Haider and one-third to Rudolph Motti, both of St. Paul, Minn.

' Application Mayil, 1941, Serial No. 394,353

2 Claims.

My inventionA relates yto improvements in portable elevators for use more particularly, although not necessarily, in construction work to lift loads Y of material and workmen to different levels, corresponding to floor levels.

The principal object of the invention is to provide a simply constructed, light-weight, strong apparatus of this character which may` readily vbe moved from place to place, as the case may require, requires no setting up of parts, is easy to gether with the precise nature ofrny improvements, will be readily understood when the succeeding description and claims are read with reference to the drawings accompanying and forming part of this specification.

In said drawings: v

Figure l is a View in rear elevation of a preferred embodiment of my invention,

Figure 2 is a view in side elevation,

Figure 3 is a View in front elevation,

Figure 4 is a View in horizontal section taken on the line 4 4 ofFigure 3 and drawn to an venlarged scale,

Figure 5 is a View in transverse section of the lift or cage,

` Figure 6 is a fragmentary View partly in section Referring to the drawings by numerals, in the J illustrated embodiment thereof my improved elevator comprises a carriage yI having the form of a generally rectangular bed 2 provided with 4small diameter rollers 3 suitably journalled, as

at 4, therein so as to provide a low center of gravity for the bed 2.

The bed 2 is designed to support a superstrucv ture including a rectangular base 5 fitting flat on the bed 2 yand from which arise corner uprights 6 defining a generally rectangular skeleton elevator shaft, there being a pair of suchuprights 6 at what constitutes the front side of the shaft, and a similar pair at the rear side of said shaft. A pair of vertical reinforcing cleats 'l extend along the inner sides of the front uprights 6. A flat bottom rest 8, for a purpose presently seen, is provided at the bottom of the shaft intermediate they uprights li. Horizontal tie bars 9 connect the front and rear side uprights at suitable levels. The front Vside uprights 6 are` connected at the tops thereof by a cross bar I0, and the rear side uprights 6 are similarly connected by the cross bar II. A frame comprising a pair of standards I2 and a top cross bar I3 arises from opposite sides of the shaft or superstructure and for a purpose presently explained. `A sheave I4 is suspended from the top bar I3 centrally thereof by an eye-bolt I5. An idler pulley I6 is suitably mounted on one of the standards I2. A pair of channel guides I'I, for a lift or cage presently described, are suitably mounted in the shaft or superstructure in upstanding position centrally of the shaft upon opposite sides thereof. At the front side of the shaft and at substantially the level of the usual second oor of a building above the ground or first floor, a cross beam I8 is provided with its ends suitably secured to the front side uprights 6. The front side of the shaft above the beam I8 is closed against exit from the shaft by a skeleton wall comprising, in the present instance, the cross beam I9 and upright panels 2t) extending from the cross beam I9 to the top bar I0. y

A stop bail is provided at the top of the shaft comprising a pair of side arms 2l, and a cross bar 22, the side arms being pivoted on hooks 23 secured at the 'top of the shaft at opposite sides thereof, the arrangement being such that the stop bail is swingable upwardly over the topof the shaft proper into a position to limit upward movement of the lift or cage, presently described, when said lift reaches a level corresponding to the level of the usual third floor of a building.

The stop bail 22, 2|, may be swung downwardly l when not in use into a pair of notches 24 pro-l vided in the rear pair of uprights 6, whereby said stop bail may be adjusted into an out of the way idle position.

The lift or cage, comprises a flat bottom 26, a pair of side frames 21, and a top cross bar 28, having an eye bolt 29 therein to which is connected one end of the hoisting cable 3d trained over the aforementioned sheave Id and idler I6 and then downwardly along one side of the shaft to a hoisting drum 3l suitably mounted on the base 5 of the shaft.

A hoisting engine of the internal combustion `type designated 32 is mounted on the base 5 at one side of the shaft and operatively connected to the hoisting drum 3l by a clutch 33 adapted to be disengaged by a suitable hand lever 34 against the tension of a suitably arranged spring 35. The numeral 36 designates a fuel supply tank for the engine 32.

Side guides 31 on the liftor cage, and extending into the aforementioned guide channels I 'I guide the lift or cage during elevation and lowering thereof.

At the front of the shaft and at the bottom thereof is a loading platform 38 having an inner end journalled on a cross rod 39 so that said platform is vertically swingable downwardly and outwardly of the shaft into downwardly and outwardly inclined position, or, upwardly and inwardly of the shaft into a vertical out of the way position. The rod 3S is suitably fixed in a pair of posts il upstanding from the base 5 at 0pposite sides of the shaft. A cable 4I secured at one end as at 42 to the loading platform 38 and trained over a pulley 43 on one of the posts 48 provides manipulative means for swinging the loading platform 38 upwardly. A suitable cleat 44 on one of the uprights 6 is provided for winding of the cable thereon to hold the loading platform in upwardly swung position.

Returning now to the lift or cage, at the rear side thereof is an unloading platform 5 having an end hinged, as at 46, to the rear edge of the lift or cage, the arrangement being such that the unloading platform may be swung downwardly and outwardly of the lift or cage into alinement with the bottom 26 thereof, or, swung upwardly into substantially vertical position. A pair of side wings l on the unloading platform d5, abut the rear edges of the side walls 21 of the lift or cage when the loading platform is swung upwardly and thereby establish the vertical position of said platform. A pair of coiled springs 68 suitably connected, as at t9, to opposite sides of the unloading platform 45 and similarly connected, as at 58, to the side walls Z'I of the lift or cage narmally act to swing the loading platform into vertical position. A cable il is attached at one end to an eye bolt 52 on the rear edge of the bottom 26 of the lift or cage and is trained upwardly through a guide 53 in the unloading platform 45, said cable having a free looped end 54 adapted to be attached to a hook 55 on the bottom 2G of the cage or lift so as to retain the unloading platform l in vertical idle position. A cleat 55 extending across the bottom 2680i the lift or cage at the front edge of said bottom provides a chock preventing implements such as wheelbarrows from rolling off the lift or cage at the front thereof.

A pair of hand grip bars 5l may be provided at opposite sides of the shaft, one being shown in the present instance, and by means of which the structure may be wheeled from place to place as desired.

Jacks 58 are provided at opposite sides of the base 5, said jacks comprising, preferably, flat blocks pivoted at one end as at 59 to said base 5 for swinging downwardly into engagement with the ground to lift the base 5 and carriage 2 off the ground sufhciently to disengage the rollers 3 from the latter, the arrangement being such that said jacks support the entire weight of the structure and prevent shifting of the same on the rollers 3. Cranks 5i) are provided on the jacks 58 for swinging the same downwardly. Normally, said jacks 58 are swung upwardly into idle position to permit the rollers 3 to sustain the weight of the structure and also to permit the structure to be rolled or shifted as desired.

Preferably, the rear of the shaft between the beam I 8 and bottom of the shaft is closed against exit from the shaft by suitable cross panels 5I as shown in Figure 1.

The numeral B2 represents eye bolts for the attachment of the cables to the carriage I to pull the structure into different positions and which may be provided on side edges of said carriage I in any desired number and location on said side edges.

Although two jacks 58 only, are illustrated in the drawings, it is to be understood that as many of such instrumentalities may be provided as is found suitable to elevate the structure off the ground.

The manner in which the described invention is used and operated will be readily understood. The structure is shoved or pulled along the ground or floor into proper relation to the floors of a building construction job with the rear side of the shaft facing the floors. With the lift or cage lowered onto the bottom 8 of the shaft, and the loading platform 33 lowered to the ground or oor, the lift or cage is loaded with implements, men, or materials by way of the loading platform 38. The rear bars 6! block and prevent such implements as wheelbarrows, or barrels, from rolling off the rear of the lift or cage. The lift or cage is then elevated to the desired floor level, in a manner which will be obvious, and the unloading platform 45 lowered as shown in dotted lines in Figure 5, the cables 5I being rst detached from the hook 55 to permit the operation.

The lift or cage may then be unloaded at will.

In the position of the lift or cage at the second floor level, and also third oor level, the described panels 20 and bars l0 and I9 block and prevent materials or articles from rolling off the lift or cage at the front side of the shaft. When it is desired to lower the lift or cage, the unloading platform l5 is raised to vertical position and retained in such position by the cables 5I. The springs t8 act to swing the unloading platform vd5 into vertical position but such springs are constructed and arranged to be overcome by a light load on the unloading platform. The manner in which the stop yoke I2, I3, also the jacks 58 are used has already been described and need not again be entered into.

The foregoing, it is believed, will suflice to impart a clear understanding of my invention without further explanation.

Manifestly the invention, as described, is susceptible of modification without departing from the inventive concept, and right is herein reserved to such modifications as fall within the scope of the subjoined claims.

What I claim is:

1. A portable elevator comprising a wheel supported base, a skeleton shaft forming structure arising from said base and including a front side and a rear side, a lift in said shaft, power operated means for elevating the lift to different levels corresponding to floor levels of a building, means closing the front side of the structure above a level corresponding to the second floor level, means closing the rear side of the structure from the bottom of the structure from the bottom of the structure to a level corresponding to the second floor level, a loading platform pivotally mounted on said structure at the bottom and front side thereof and vertically swingable in opposite directions to lower the same to the ground and elevate the same into substantially vertical position, and manipulative means to elevate said platform comprising a cable and a pulley over which the cable is trained.

2. A portable elevator comprising a wheel supported base, a skeleton shaft forming structure arising from said base and including a front corresponding to the second floor level, and a stop yoke pivotally mounted at the top of the structure for swinging into the path of the lift to prevent elevation thereof out of the top of the structure.

MARTIN M. HAIDER. 

